import { OB11EmitEventContent, OB11NetworkReloadType } from './index';
import { URL } from 'url';
import { RawData, WebSocket, WebSocketServer } from 'ws';
import { Mutex } from 'async-mutex';
import { OB11Response } from '@/napcat-onebot/action/OneBotAction';
import { ActionName } from '@/napcat-onebot/action/router';
import { NapCatCore } from 'napcat-core';
import { OB11HeartbeatEvent } from '@/napcat-onebot/event/meta/OB11HeartbeatEvent';
import { IncomingMessage } from 'http';
import { ActionMap } from '@/napcat-onebot/action';
import { LifeCycleSubType, OB11LifeCycleEvent } from '@/napcat-onebot/event/meta/OB11LifeCycleEvent';
import { WebsocketServerConfig } from '@/napcat-onebot/config/config';
import { NapCatOneBot11Adapter } from '@/napcat-onebot/index';
import { IOB11NetworkAdapter } from '@/napcat-onebot/network/adapter';
import json5 from 'json5';

export class OB11WebSocketServerAdapter extends IOB11NetworkAdapter<WebsocketServerConfig> {
  wsServer?: WebSocketServer;
  wsClients: WebSocket[] = [];
  wsClientsMutex = new Mutex();
  private heartbeatIntervalId: NodeJS.Timeout | null = null;
  wsClientWithEvent: WebSocket[] = [];

  constructor (
    name: string, config: WebsocketServerConfig, core: NapCatCore, obContext: NapCatOneBot11Adapter, actions: ActionMap
  ) {
    super(name, config, core, obContext, actions);
    this.wsServer = new WebSocketServer({
      port: this.config.port,
      host: this.config.host === '0.0.0.0' ? '' : this.config.host,
      maxPayload: 1024 * 1024 * 1024,
    });
    this.createServer(this.wsServer);
  }

  createServer (newServer: WebSocketServer) {
    newServer.on('connection', async (wsClient, wsReq) => {
      if (!this.isEnable) {
        wsClient.close();
        return;
      }
      // 鉴权 close 不会立刻销毁 当前返回可避免挂载message事件 close 并未立刻关闭 而是存在timer操作后关闭
      // 引发高危漏洞
      if (!this.authorize(this.config.token, wsClient, wsReq)) {
        return;
      }
      const paramUrl = wsReq.url?.indexOf('?') !== -1 ? wsReq.url?.substring(0, wsReq.url?.indexOf('?')) : wsReq.url;
      const isApiConnect = paramUrl === '/api' || paramUrl === '/api/';
      if (!isApiConnect) {
        this.connectEvent(this.core, wsClient);
      }

      wsClient.on('error', (err) => this.logger.log('[OneBot] [WebSocket Server] Client Error:', err.message));
      wsClient.on('message', (message) => {
        this.handleMessage(wsClient, message).then().catch(e => this.logger.logError(e));
      });
      wsClient.on('ping', () => {
        wsClient.pong();
      });
      wsClient.on('pong', () => {
        // this.logger.logDebug('[OneBot] [WebSocket Server] Pong received');
      });
      wsClient.once('close', () => {
        this.wsClientsMutex.runExclusive(async () => {
          const NormolIndex = this.wsClients.indexOf(wsClient);
          if (NormolIndex !== -1) {
            this.wsClients.splice(NormolIndex, 1);
          }
          const EventIndex = this.wsClientWithEvent.indexOf(wsClient);
          if (EventIndex !== -1) {
            this.wsClientWithEvent.splice(EventIndex, 1);
          }
        });
      });
      await this.wsClientsMutex.runExclusive(async () => {
        if (!isApiConnect) {
          this.wsClientWithEvent.push(wsClient);
        }
        this.wsClients.push(wsClient);
      });
    }).on('error', (err) => this.logger.log('[OneBot] [WebSocket Server] Server Error:', err.message));
  }

  connectEvent (core: NapCatCore, wsClient: WebSocket) {
    try {
      this.checkStateAndReply<unknown>(new OB11LifeCycleEvent(core, LifeCycleSubType.CONNECT), wsClient).catch(e => this.logger.logError('[OneBot] [WebSocket Server] 发送生命周期失败', e));
    } catch (e) {
      this.logger.logError('[OneBot] [WebSocket Server] 发送生命周期失败', e);
    }
  }

  async onEvent<T extends OB11EmitEventContent> (event: T) {
    this.wsClientsMutex.runExclusive(async () => {
      const promises = this.wsClientWithEvent.map((wsClient) => {
        return new Promise<void>((resolve, reject) => {
          if (wsClient.readyState === WebSocket.OPEN) {
            wsClient.send(JSON.stringify(event));
            resolve();
          } else {
            reject(new Error('WebSocket is not open'));
          }
        });
      });
      await Promise.allSettled(promises);
    });
  }

  open () {
    if (this.isEnable) {
      this.logger.logError('[OneBot] [WebSocket Server] Cannot open a opened WebSocket server');
      return;
    }
    const addressInfo = this.wsServer?.address();
    this.logger.log('[OneBot] [WebSocket Server] Server Started', typeof (addressInfo) === 'string' ? addressInfo : addressInfo?.address + ':' + addressInfo?.port);

    this.isEnable = true;
    if (this.config.heartInterval > 0) {
      this.registerHeartBeat();
    }
  }

  async close () {
    this.isEnable = false;
    this.wsServer?.close((err) => {
      if (err) {
        this.logger.logError('[OneBot] [WebSocket Server] Error closing server:', err.message);
      } else {
        this.logger.log('[OneBot] [WebSocket Server] Server Closed');
      }
    });
    if (this.heartbeatIntervalId) {
      clearInterval(this.heartbeatIntervalId);
      this.heartbeatIntervalId = null;
    }
    await this.wsClientsMutex.runExclusive(async () => {
      this.wsClients.forEach((wsClient) => {
        wsClient.close();
      });
      this.wsClients = [];
      this.wsClientWithEvent = [];
    });
  }

  private registerHeartBeat () {
    this.heartbeatIntervalId = setInterval(() => {
      this.wsClientsMutex.runExclusive(async () => {
        this.wsClientWithEvent.forEach((wsClient) => {
          if (wsClient.readyState === WebSocket.OPEN) {
            wsClient.send(JSON.stringify(new OB11HeartbeatEvent(this.core, this.config.heartInterval, this.core.selfInfo.online ?? true, true)));
          }
        });
      });
    }, this.config.heartInterval);
  }

  private authorize (token: string | undefined, wsClient: WebSocket, wsReq: IncomingMessage) {
    if (!token || token.length === 0) return true;// 客户端未设置密钥
    const url = new URL(wsReq?.url || '', `http://${wsReq.headers.host}`);
    const QueryClientToken = url.searchParams.get('access_token');
    const HeaderClientToken = wsReq.headers.authorization?.split('Bearer ').pop() || '';
    const ClientToken = typeof (QueryClientToken) === 'string' && QueryClientToken !== '' ? QueryClientToken : HeaderClientToken;
    if (ClientToken === token) {
      return true;
    }
    wsClient.send(JSON.stringify(OB11Response.res(null, 'failed', 1403, 'token验证失败')));
    wsClient.close();
    return false;
  }

  private async checkStateAndReply<T> (data: T, wsClient: WebSocket) {
    return await new Promise<void>((resolve, reject) => {
      if (wsClient.readyState === WebSocket.OPEN) {
        wsClient.send(JSON.stringify(data));
        resolve();
      } else {
        reject(new Error('WebSocket is not open'));
      }
    });
  }

  private async handleMessage (wsClient: WebSocket, message: RawData) {
    let receiveData: { action: typeof ActionName[keyof typeof ActionName], params?: any, echo?: any; } = { action: ActionName.Unknown, params: {} };
    let echo;
    try {
      receiveData = json5.parse(message.toString());
      echo = receiveData.echo;
      // this.logger.logDebug('收到正向Websocket消息', receiveData);
    } catch {
      await this.checkStateAndReply<unknown>(OB11Response.error('json解析失败,请检查数据格式', 1400, echo), wsClient);
      return;
    }
    receiveData.params = (receiveData?.params) ? receiveData.params : {};// 兼容类型验证 不然类型校验爆炸

    const action = this.actions.get(receiveData.action as any);
    if (!action) {
      this.logger.logError('[OneBot] [WebSocket Client] 发生错误', '不支持的API ' + receiveData.action);
      await this.checkStateAndReply<unknown>(OB11Response.error('不支持的API ' + receiveData.action, 1404, echo), wsClient);
      return;
    }
    const retdata = await action.websocketHandle(receiveData.params, echo ?? '', this.name, this.config, {
      send: async (data: object) => {
        await this.checkStateAndReply<unknown>({ ...OB11Response.ok(data, echo ?? '', true) }, wsClient);
      },
    });
    await this.checkStateAndReply<unknown>({ ...retdata }, wsClient);
  }

  async reload (newConfig: WebsocketServerConfig) {
    const wasEnabled = this.isEnable;
    const oldPort = this.config.port;
    const oldHost = this.config.host;
    const oldHeartbeatInterval = this.config.heartInterval;
    this.config = newConfig;

    if (newConfig.enable && !wasEnabled) {
      this.open();
      return OB11NetworkReloadType.NetWorkOpen;
    } else if (!newConfig.enable && wasEnabled) {
      this.close();
      return OB11NetworkReloadType.NetWorkClose;
    }

    if (oldPort !== newConfig.port || oldHost !== newConfig.host) {
      this.close();
      this.wsServer = new WebSocketServer({
        port: newConfig.port,
        host: newConfig.host === '0.0.0.0' ? '' : newConfig.host,
        maxPayload: 1024 * 1024 * 1024,
      });
      this.createServer(this.wsServer);
      if (newConfig.enable) {
        this.open();
      }
      return OB11NetworkReloadType.NetWorkReload;
    }

    if (oldHeartbeatInterval !== newConfig.heartInterval) {
      if (this.heartbeatIntervalId) {
        clearInterval(this.heartbeatIntervalId);
        this.heartbeatIntervalId = null;
      }
      if (newConfig.heartInterval > 0 && this.isEnable) {
        this.registerHeartBeat();
      }
      return OB11NetworkReloadType.NetWorkReload;
    }

    return OB11NetworkReloadType.Normal;
  }
}
